19. Yu Fu, Xun-Xiang Guo, Shou-Fei Zhu, Ai-Guo Hu, Jian-Hua Xie, Qi-Lin Zhou*, Rhodium-catalyzed asymmetric hydrogenation of functionalized olefins using monodentate spiro phosphoramidite ligands, J. Org. Chem. 2004, 69, 4648-4655.